I've got a snow performance stage 2 kit on my '99 truck. I think its cool, but wish I'd either not bothered or got the stage 3 kit (or mileage max or whatever they call it) that uses exhaust temps as part of the info to base the injection quantity off of. Just having a boost controlled injection curve may be fine for some applications, but I do a lot of towing and find I can go through a LOT of fluid and not always have it injecting when I want it to be, because boost is only 1 part of what needs to be considered when injecting water/methanol.

Had the Snow Performance Tow-Max installed and professionally tuned. It is tune for EGT's and for boost.
What a difference. Dropped the EGT's by 300 degrees and you can feel the increased HP.
Now to find a source of Methanol. Presently I am using -40 windshield anti freeze which is 50% methanol, but we are planning a trip to Arizona in the new year and I am thinking -40 windshield anti freeze is going to be difficult to find. May have to make a trip to Golden, Co, see Max and drop into Snow Performance and pick up some Boost Juice.

I am using -40* windshield washer antifreeze. It is 50% methanol and that is what Harbour City tuned to.
It has performed wonderfully.
We will see as we are headed to Arizona for 4 weeks starting the end of Feb.2014. May have to make a trip to Golden Co and pick up some Boost Juice from Snow Performance and make a visit to visit Max.